CVE-2026-41246: Contour is a Kubernetes ingress controller using Envoy proxy

This month

HIGH 8.1WATCHLISTUPGRADE

CVE-2026-41246 is a high-severity flaw (CVSS 8.1) affecting contour. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Contour is a Kubernetes ingress controller using Envoy proxy. From v1.19.0 to before v1.33.4, v1.32.5, and v1.31.6, Contour's Cookie Rewriting feature is vulnerable to Lua code injection. An attacker with RBAC permissions to create or modify HTTPProxy resources can craft a malicious value in spec.routes[].cookieRewritePolicies[].pathRewrite.value or spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value that results in arbitrary code

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-04-23
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: projectcontour

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-23 19:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

projectcontour contour UPGRADE

Affected: >= 1.19.0 and < 1.31.6 · >= 1.32.0 and < 1.32.5 · >= 1.33.0 and < 1.33.4

Fixed in: 1.31.6, 1.32.5, 1.33.4

Safe to downgrade to: a release before 1.19.0

1. Check installed version

apt-cache policy contour || rpm -q contour || contour --version

2. UPGRADE to 1.31.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade contour

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade contour

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.19.0 (Debian / Ubuntu)

apt-cache madison contour sudo apt install contour=<VERSION_BEFORE_1.19.0> sudo apt-mark hold contour

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list contour sudo dnf downgrade contour-<VERSION_BEFORE_1.19.0> sudo dnf versionlock add contour

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41246?

contour: upgrade to 1.31.6, 1.32.5, 1.33.4. Exact commands for each OS are on this page.

Is CVE-2026-41246 being exploited?

CVE-2026-41246 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41246 affect?

CVE-2026-41246 affects contour. Severity is high (CVSS 8.1). Contour is a Kubernetes ingress controller using Envoy proxy. From v1.19.0 to before v1.33.4, v1.32.5, and v1.31.6, Contour's Cookie Rewriting feature is vulnerable to Lua code injection. An attacker with RBAC permissions to create or modif

How urgent is CVE-2026-41246?

Priority 44/100. High severity; On your watchlist

Software pages

Kubernetes vulnerabilities · Envoy vulnerabilities

References

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